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M400E Ozone Analyzer Operator’s Manual Getting Started
3.4. PNENUMATIC CONNECTIONS
CAUTION
General Safety Hazard
OZONE (O
3
) IS A TOXIC GAS.
OBTAIN A MATERIAL SAFETY DATA SHEET (MSDS) FOR THIS MATERIAL.
READ AND RIGOROUSLY FOLLOW THE SAFETY GUIDELINES
DESCRIBED THERE.
DO NOT VENT CALIBRATION GAS AND SAMPLE GAS INTO ENCLOSED
AREAS
SAMPLE AND CALIBRATION GASES SHOULD ONLY COME INTO
CONTACT WITH PTFE, FEP OR GLASS.
NOTE:
Sample and calibration gases should only come into contact with PTFE, FEP or glass.
3.4.1. ABOUT ZERO AIR AND CALIBRATION GAS
ZERO AIR
Zero air is similar in chemical composition to the Earth’s atmosphere but scrubbed of all components that might
affect the analyzer’s readings. It is recommended that an external zero air generator such as the Teledyne
Instruments Model 701 be used
CALIBRATION (SPAN) GAS
Calibration gas is a gas specifically mixed to match the chemical composition of the type of gas being measured
at near full scale of the desired reporting range. Because ozone (O
3
) quickly breaks down into molecular oxygen
(O
2
), this calibration gas cannot be supplied in precisely calibrated bottles like other gases.
If the M400E analyzer is not equipped with the optional internal zero air generator (IZS), an external O
3
generator capable supplying accurate O
3
calibration mixtures must be used.
Also, some applications, such as EPA monitoring, require multipoint calibration checks where Span gas
of several different concentrations is needed.
In either case, we recommend using a Gas Dilution Calibrator such as a T-API Model 700 with internal
photometer option.
In the case of O
3
measurements made with the Model 400E photometric ozone analyzer, it is recommended that
you use a span gas with an O
3
concentration equal to 80% of the reporting range for your application.
EXAMPLE:
If the application is to measure between 0 ppm and 500 ppb, an appropriate span gas would be 400
ppb.
If the application is to measure between 0 ppb and 1000 ppb, an appropriate span gas would be 800
ppb.
04315 Rev. C1 21